1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #ifndef _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
10 #define _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
11
12 #include <__algorithm/pstl_backend.h>
13 #include <__config>
14 #include <__iterator/cpp17_iterator_concepts.h>
15 #include <__type_traits/enable_if.h>
16 #include <__type_traits/is_execution_policy.h>
17 #include <__type_traits/remove_cvref.h>
18 #include <__utility/move.h>
19 #include <optional>
20
21 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
22 # pragma GCC system_header
23 #endif
24
25 #if !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
26
27 _LIBCPP_BEGIN_NAMESPACE_STD
28
29 template <class _ExecutionPolicy,
30 class _ForwardIterator,
31 class _ForwardOutIterator,
32 class _UnaryOperation,
33 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
34 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
35 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>>
__transform(_ExecutionPolicy &&,_ForwardIterator && __first,_ForwardIterator && __last,_ForwardOutIterator && __result,_UnaryOperation && __op)36 __transform(_ExecutionPolicy&&,
37 _ForwardIterator&& __first,
38 _ForwardIterator&& __last,
39 _ForwardOutIterator&& __result,
40 _UnaryOperation&& __op) noexcept {
41 using _Backend = typename __select_backend<_RawPolicy>::type;
42 return std::__pstl_transform<_RawPolicy>(
43 _Backend{}, std::move(__first), std::move(__last), std::move(__result), std::move(__op));
44 }
45
46 template <class _ExecutionPolicy,
47 class _ForwardIterator,
48 class _ForwardOutIterator,
49 class _UnaryOperation,
50 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
51 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
transform(_ExecutionPolicy && __policy,_ForwardIterator __first,_ForwardIterator __last,_ForwardOutIterator __result,_UnaryOperation __op)52 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
53 _ExecutionPolicy&& __policy,
54 _ForwardIterator __first,
55 _ForwardIterator __last,
56 _ForwardOutIterator __result,
57 _UnaryOperation __op) {
58 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator);
59 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
60 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first)));
61 auto __res = std::__transform(__policy, std::move(__first), std::move(__last), std::move(__result), std::move(__op));
62 if (!__res)
63 std::__throw_bad_alloc();
64 return *std::move(__res);
65 }
66
67 template <class _ExecutionPolicy,
68 class _ForwardIterator1,
69 class _ForwardIterator2,
70 class _ForwardOutIterator,
71 class _BinaryOperation,
72 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
73 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
74 _LIBCPP_HIDE_FROM_ABI optional<__remove_cvref_t<_ForwardOutIterator>>
__transform(_ExecutionPolicy &&,_ForwardIterator1 && __first1,_ForwardIterator1 && __last1,_ForwardIterator2 && __first2,_ForwardOutIterator && __result,_BinaryOperation && __op)75 __transform(_ExecutionPolicy&&,
76 _ForwardIterator1&& __first1,
77 _ForwardIterator1&& __last1,
78 _ForwardIterator2&& __first2,
79 _ForwardOutIterator&& __result,
80 _BinaryOperation&& __op) noexcept {
81 using _Backend = typename __select_backend<_RawPolicy>::type;
82 return std::__pstl_transform<_RawPolicy>(
83 _Backend{}, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op));
84 }
85
86 template <class _ExecutionPolicy,
87 class _ForwardIterator1,
88 class _ForwardIterator2,
89 class _ForwardOutIterator,
90 class _BinaryOperation,
91 class _RawPolicy = __remove_cvref_t<_ExecutionPolicy>,
92 enable_if_t<is_execution_policy_v<_RawPolicy>, int> = 0>
transform(_ExecutionPolicy && __policy,_ForwardIterator1 __first1,_ForwardIterator1 __last1,_ForwardIterator2 __first2,_ForwardOutIterator __result,_BinaryOperation __op)93 _LIBCPP_HIDE_FROM_ABI _ForwardOutIterator transform(
94 _ExecutionPolicy&& __policy,
95 _ForwardIterator1 __first1,
96 _ForwardIterator1 __last1,
97 _ForwardIterator2 __first2,
98 _ForwardOutIterator __result,
99 _BinaryOperation __op) {
100 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator1);
101 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardIterator2);
102 _LIBCPP_REQUIRE_CPP17_FORWARD_ITERATOR(_ForwardOutIterator);
103 _LIBCPP_REQUIRE_CPP17_OUTPUT_ITERATOR(_ForwardOutIterator, decltype(__op(*__first1, *__first2)));
104 auto __res = std::__transform(
105 __policy, std::move(__first1), std::move(__last1), std::move(__first2), std::move(__result), std::move(__op));
106 if (!__res)
107 std::__throw_bad_alloc();
108 return *std::move(__res);
109 }
110
111 _LIBCPP_END_NAMESPACE_STD
112
113 #endif // !defined(_LIBCPP_HAS_NO_INCOMPLETE_PSTL) && _LIBCPP_STD_VER >= 17
114
115 #endif // _LIBCPP___ALGORITHM_PSTL_TRANSFORM_H
116